27 Dec 2013

Plan-Do-Check-Act (PDCA)


Something needs to change: Something's wrong, and needs to be fixed, and you've worked hard to create a credible vision of where you want it to be in future. But are you 100% sure that you're right? And are you absolutely certain that your solution will work perfectly, in every way?
Where the consequences of getting things wrong are significant, it often makes sense to run a well-crafted pilot project. That way if the pilot doesn't deliver the results you expected, you get the chance to fix and improve things before you fully commit your reputation and resources.
So how do you make sure that you get this right, not just this time but every time? The solution is to have a process that you follow when you need to make a change or solve a problem; A process that will ensure you plan, test and incorporate feedback before you commit to implementation.
A popular tool for doing just this is the Plan-Do-Check-Act Cycle. This is often referred to as the Deming Cycle or the Deming Wheel after its proponent, W Edwards Deming. It is also sometimes called the Shewhart Cycle.
Deming is best known as a pioneer of the quality management approach and for introducing statistical process control techniques for manufacturing to the Japanese, who used them with great success. He believed that a key source of production quality lay in having clearly defined, repeatable processes. And so the PDCA Cycle as an approach to change and problem solving is very much at the heart of Deming's quality-driven philosophy.
The four phases in the Plan-Do-Check-Act Cycle involve:
Plan: Identifying and analyzing the problem.
Do: Developing and testing a potential solution.
Check: Measuring how effective the test solution was, and analyzing whether it could be improved in any way.
Act: Implementing the improved solution fully.
These are shown in Figure 1 below.

There can be any number of iterations of the "Do" and "Check" phases, as the solution is refined, retested, re-refined and retested again.
How to Use the Tool
The PDCA Cycle encourages you to be methodical in your approach to problem solving and implementing solutions. Follow the steps below every time to ensure you get the highest quality solution possible.
Step 1: Plan
First, identify exactly what your problem is. You may find it useful to use tools like Drill Down, Cause and Effect Diagrams, and the 5 Whys to help you really get to the root of it. Once you've done this, it may be appropriate for you to map the process that is at the root of the problem
Next, draw together any other information you need that will help you start sketching out solutions.
Step 2: Do
This phase involves several activities:
Generate possible solutions.
Select the best of these solutions, perhaps using techniques like Impact Analysis to scrutinize them.
Implement a pilot project on a small scale basis, with a small group, or in a limited geographical area, or using some other trial design appropriate to the nature of your problem, product or initiative.
Our section on Practical Creativity includes several tools that can help you generate ideas and solutions. Our section on Decision Making includes a number of tools that will help you to choose in a scientific and dispassionate way between the various potential solutions you generate.

Note:
The phrase "Plan Do Check Act" or PDCA is easy to remember, but it's important you are quite clear exactly what "Do" means. ""Do" means "Try" or "Test". It does not mean "Implement fully." Full implementation happens in the "Act" phase.

Step 3: Check
In this phase, you measure how effective the pilot solution has been, and gather together any learnings from it that could make it even better.
Depending on the success of the pilot, the number of areas for improvement you have identified, and the scope of the whole initiative, you may decide to repeat the "Do" and "Check" phases, incorporating your additional improvements.
Once you are finally satisfied that the costs would outweigh the benefits of repeating the Do-Check sub-cycle any more, you can move on to the final phase.
Step 4: Act        
Now you implement your solution fully. However, your use of the PDCA Cycle doesn't necessarily stop there. If you are using the PDCA or Deming Wheel as part of a continuous improvement initiative, you need to loop back to the Plan Phase (Step 1), and seek out further areas for improvement.
When to use the Deming Cycle
The Deming Cycle provides a useful, controlled problem solving process. It is particularly effective for:
Helping implement Kaizen or Continuous Improvement approaches, when the cycle is repeated again and again as new areas for improvement are sought and solved.
Identifying new solutions and improvement to processes that are repeated frequently. In this situation, you will benefit from extra improvements built in to the process many times over once it is implemented.
Exploring a range of possible new solutions to problems, and trying them out and improving them in a controlled way before selecting one for full implementation.
Avoiding the large scale wastage of resources that comes with full scale implementation of a mediocre or poor solution.
Clearly, use of a Deming Cycle approach is slower and more measured than a straightforward "gung ho" implementation. In true emergency situations, this means that it may not be appropriate (however, it's easy for people to think that situations are more of an emergency than, in reality, they really are...)

Note:
PDCA is closely related to the Spiral Development Approach which is popular in certain areas of software development, especially where the overall system develops incrementally. Spiral Development repeats loops of the PDCA cycle, as developers identify functionality needed, develop it, test it, implement it, and then go back to identify another sub-system of functionality.
Key Points:
The Plan-Do-Check-Act (PDCA) Cycle provides a simple but effective approach for problem solving and managing change, ensuring that ideas are appropriately tested before committing to full implementation. It can be used in all sorts of environments from new product development through to marketing, or even politics.
It begins with a Planning phase in which the problem is clearly identified and understood. Potential solutions are then generated and tested on a small scale in the "Do" phase, and the outcome of this testing is evaluated during the Check phase. "Do" and "Check" phases can be iterated as many times as is necessary before the full, polished solution is implemented in the "Act" phase.

The How

Here are the basic steps needed for continuous improvement:

This assumes that you have a continuous improvement manager identified (this need not be a full time job for small organizations—this could be as little as 30 minutes a day).

Identify a project that offers a high certainty of visible results — you do not want to have a failure on your first attempt — there will be plenty of time for that in the future as your willingness to take risk grows.
Determine current performance by base lining. Make sure your base line defines the targeted area of improvement.
Obtain commitment of both management and the people in the target area. Define the improvement objective — but in terms of process change not “X” number more widgets. This might be an improvement in quality (scrap/rework reduction), an incremental but undefined reduction in cycle time or ergonomic improvements.
Organize the team. This will include the program manager, the area personnel and supervisor and often members from other areas in the plant as “fresh eyes.” Occasionally, outside help may be beneficial.
Identify the causes of the current performance limitations.
Define potential solutions and test to determine if they will accomplish the improvement objective.
Document an improvement plan that defines exactly how and by whom the changes will be implemented.
Identify and overcome (where possible) unwarranted resistance to the change. There will always be resistance, particularly at the beginning of this journey. Use persuasion whenever possible but be aware that on occasion you may have to move the resistance out of the way.
Implement the change.
Put in place controls to maintain the changes, monitor and verify the results.
Acknowledge and reward the success.  Encouragement of the people, who have made the improvements, however small, is an important component. The success needs to be acknowledged and publicized across the organization with equal credit going to the entire team. Reward the team — but within reason. A pizza party and extended lunch for the team that had a major accomplishment might be far more appropriate in your organization than some flashy award that can cause ill feelings across the entire organization.
Notice the PDCA diagram is a circle — begin again!
I cannot close without a comment on failure — it will happen. Accept that whenever you do something new or different, failure is a possibility. DO NOT go in search of the guilty. Understand why there was a failure, fix the cause, learn from it and move on. If you have followed all the steps the failures will surface during the test phase. Thus the results are only uncomfortable — and possibly embarrassing — not catastrophic.  

Obviously, I cannot do justice to this process in the space limits of this article. There are many excellent books available — one I will recommend is Out of the Crisis by W. Edwards Deming, MIT 1989.

Don’t follow the path — make one — begin the trip and enjoy the journey!

One more Plan-Do-Check-Act (PDCA) Cycle
Also called: PDCA, plan–do–study–act (PDSA) cycle, Deming cycle, Shewhart cycle
The plan–do–check–act cycle (Figure 1) is a four–step model for carrying out change. Just as a circle has no end, the PDCA cycle should be repeated again and again for continuous improvement.

Figure 1: Plan-do-check-act cycle
When to Use Plan–Do–Check–Act
As a model for continuous improvement.
When starting a new improvement project.
When developing a new or improved design of a process, product or service.
When defining a repetitive work process.
When planning data collection and analysis in order to verify and prioritize problems or root causes.
When implementing any change.
Plan–Do–Check–Act Procedure
Plan. Recognize an opportunity and plan a change.
Do. Test the change. Carry out a small-scale study.
Check. Review the test, analyze the results and identify what you’ve learned.
Act. Take action based on what you learned in the study step: If the change did not work, go through the cycle again with a different plan. If you were successful, incorporate what you learned from the test into wider changes. Use what you learned to plan new improvements, beginning the cycle again.
Plan–Do–Check–Act Example (use for case study)
The Pearl River, NY School District, a 2001 recipient of the Malcolm Baldrige National Quality Award, uses the PDCA cycle as a model for defining most of their work processes, from the boardroom to the classroom.
PDCA is the basic structure for the district’s overall strategic planning, needs–analysis, curriculum design and delivery, staff goal-setting and evaluation, provision of student services and support services, and classroom instruction.
Figure 2 shows their “A+ Approach to Classroom Success.” This is a continuous cycle of designing curriculum and delivering classroom instruction. Improvement is not a separate activity: It is built into the work process.

Plan. The A+ Approach begins with a “plan” step called “analyze.” In this step, students’ needs are analyzed by examining a range of data available in Pearl River’s electronic data “warehouse,” from grades to performance on standardized tests. Data can be analyzed for individual students or stratified by grade, gender or any other subgroup. Because PDCA does not specify how to analyze data, a separate data analysis process (Figure 3) is used here as well as in other processes throughout the organization.

Figure 3: Pearl River: analysis process

Do. The A+ Approach continues with two “do” steps:
“Align” asks what national and state standards require and how they will be assessed. Teaching staff also plans curriculum by looking at what is taught at earlier and later grade levels and in other disciplines to assure a clear continuity of instruction throughout the student’s schooling. Teachers develop individual goals to improve their instruction where the “analyze” step showed any gaps.
The second “do” step is, in this example, called “act.” This is where instruction is actually provided, following the curriculum and teaching goals. Within set parameters, teachers vary the delivery of instruction based on each student’s learning rates and styles and varying teaching methods.
Check. The “check” step is called “assess” in this example. Formal and informal assessments take place continually, from daily teacher “dipstick” assessments to every-six-weeks progress reports to annual standardized tests. Teachers also can access comparative data on the electronic database to identify trends. High-need students are monitored by a special child study team.
Throughout the school year, if assessments show students are not learning as expected, mid-course corrections are made such as re-instruction, changing teaching methods and more direct teacher mentoring. Assessment data become input for the next step in the cycle.
Act. In this example the “act” step is called “standardize.” When goals are met, the curriculum design and teaching methods are considered standardized. Teachers share best practices in formal and informal settings. Results from this cycle become input for the “analyze” phase of the next A+ cycle.


Is − Is not


When to use it
Use it when you are defining a problem to decide what is in scope and what is not going to be considered at this time.
Use it also when you are part of the way through a problem and you are not sure what you are trying to do and what is not so important.
You can also use it when planning a solution, to help decide what to include and what to exclude.
  
How to use it
Build the basic diagram
Draw the basic table as below. If you are working with a group, do it on a flipchart page or a whiteboard.
Add a description of the overall situation at the top of the page. Use a separate sheet if you need more than a few words.

Add 'is' and 'is not' elements
Now simply as 'What is included here?' and 'What is not included here?', writing these down in either column as appropriate. Where it is a close division, you can add examples to clarify what falls either side of the line.
The bottom line for deciding where to place any point is to ask yourself questions such as:
Who cares about this?
What will happen if we do nothing about it?
Do we have the authority to work on this?
What do I know about this already?
Do we care about this?
Will we actually do something about this?
Do be careful when asking these questions, as you may 'throw the baby out with the bathwater' if you make incorrect assumptions about such as what authority you have and what you can actually solve.

Example
 

Situation: Wheels on car keep going out of balance
Is
Is not
Wheel problem
After high speed driving
On one car only
My problem
Urgent
On ABC tyres only
Expensive
Front wheels only
Suspension problem
When driving around town
On other cars of same make
Jane's problem
To be put off (like other problems)


How it works
Is-Is not analysis works by making you deliberately think about the problem and in particular the boundaries of what it is or is not. It thus helps to create focus in attention and consequently is more likely to lead to the right problem being solved - it is a very common issue that an unclear boundary can lead to wandering off the path and solving unimportant problems.
1. System Contradictions :

 We begin with " 5W's and an H " of Innovation. Ask these question of every system so that the system function and problem is identified.

W1.  Who has the problem?
W2.  What does the problem seem to be? What are the resources?
W3.  When does the problem occur? Under what circumstances?
W4.  Where does the problem occur?
W5.  Why does the problem occur? What is root cause?
And
H1.  How  does the problem occur?  How can the problem be solved?

1Q.  Who has the problem? : This clearly identifies the person connected with the problem. He could be one who is using the final product or anyone in the line-up of concept-to-market or a person at any of the product Life-stages (listed below),
      stage 1:  manufacture
      stage 2:  packaging
      stage 3:  storage
      stage 4:  transportation
      stage 5:  installation
      stage 6:  operation / use
      stage 7:  maintenance
      stage 7:  repair

2Q.  What does the problem seem to be? What are the resources? :
    
      Problem specification,

     1.  Try to specify a conflict/contradiction
               -- as a technical contradiction or as a physical contradiction
     2.  Try to specify a harmful action/interaction/effect
     3.  Try to specify an inefficient useful action/interaction/effect

     Determine what is a possible remedy by using a TRIZ tool (keeping track of the resources):

     1a.  Technical Contradiction :  use Contradiction Matrix  (39 parameters and 40 inventive principles)
     1b.  Physical Contradiction : use separation principles (space, time, structure - parts/whole, on condition)
     2.   Harmful action/effect : use direct or indirect elimination  and standard solutions
     3.   Inefficient useful action/effect : use standard solutions and scientific effects
     3Q.  When does the problem occur? Under what circumstances? Determine whether
      --  Time of conflict     is    before     Time of operation
      --  Time of conflict     is    during     Time of operation
      --  Time of conflict     is    after        Time of operation
Determine what are the available time resources
Possible remedy using a TRIZ tool : 
      --  Use “separation-in-time” principle for eliminating physical contradiction
4Q.  Where does the problem occur? Determine what is the zone of conflict

     >> where is the zone of conflict in relation to the Zone of operation?

      --  zone of conflict     is    in    the      Super-system
      --  zone of conflict     is   same   as   zone of operation
      --  zone of conflict     is    in    the      Sub-system

Determine what are the available space resources
Possible remedy using a TRIZ tool : 
      --  Use “separation-in-space” principle for eliminating physical contradiction
5Q. Why does the problem occur? {“Ask WHY5 times “ - W. E. Deming} :
Identify the ‘function’ that creates/leads to the problem :
Identify 2 substances  ( “tool” and “object” ) and  1 field  (energy, enabling, acting force)

Is “tool”, “object” or “field” causing the problem?

Determine what are the available substance/field resources

Possible remedy by using a TRIZ tool:
     1.   Harmful action/effect : use direct or indirect elimination and standard solutions
     2.   Inefficient useful action/effect : use standard solutions  and scientific effects
1H.  How does the problem occur?
Keep asking  “ How? ”  till you reach the ‘root cause’ of the problem
" 5W's and an H ”  leads to a clear understanding of the problem along with

the ideal final result, the resources available and the possible TRIZ tools to solve the problem.

Poka Yoke


Poka Yoke is a quality management concept developed by a Matsushita manufacturing engineer named Shigeo Shingo to prevent human errors from occurring in the production line. Poka yoke (pronounced “poh-kah yoh-kay”) comes from two Japanese words – “yokeru” which means “to avoid”, and “poka” which means “inadvertent errors.” Thus, poka yoke more or less translates to “avoiding inadvertent errors”.
 Poka yoke is sometimes referred to in English by some people as “fool-proofing”.  However, this doesn’t sound politically correct if applied to employees, so the English equivalent used by Shingo was “error avoidance.” Other variants like “mistake proofing” or “fail-safe operation” have likewise become popular.  

The main objective of poke yoke is to achieve zero defects. In fact, it is just one of the many components of Shingo’s Zero Quality Control (ZQC) system, the goal of which is to eliminate defective products.
Poka yoke is more of a concept than a procedure.  Thus, its implementation is governed by what people think they can do to prevent errors in their workplace, and not by a set of step-by-step instructions on how they should do their job. 
Poka yoke is implemented by using simple objects like fixtures, jigs, gadgets, warning devices, paper systems, and the like to prevent people from committing mistakes, even if they try to! These objects, known as poka yoke devices, are usually used to stop the machine and alert the operator if something is about to go wrong. 
 Anybody can and should practice poka yoke in the workplace. Poke yoke does not entail any rocket science – sometimes it just needs common sense and the appropriate poka yoke device. Poka yoke devices should have the following characteristics: 1) useable by all workers; 2) simple to install; 3) does not require continuous attention from the operator (ideally, it should work even if the operator is not aware of it); 4) low-cost; 5) provides instantaneous feedback, prevention, or correction.  A lot of Shingo’s poka yoke devices cost less than $50!
 Of course, error-proofing can be achieved by extensive automation and computerization. However, this approach is expensive and complicated, and may not be practical for small operations.  Besides, it defeats the original purpose of poka yoke, which is to reduce defects from mistakes through the simplest and lowest-cost manner possible.
 Poka yoke is at its best when it prevents mistakes, not when it merely catches them. Since human errors usually stem from people who get distracted, tired, confused, or demotivated, a good poka yoke solution is one that requires no attention from the operator. Such a poka yoke device will prevent the occurrence of mistake even if the operator loses focus in what she is doing.
 Examples of ‘attention-free’ Poke Yoke solutions:
1) a jig that prevents a part from being misoriented during loading
2) non-symmetrical screw hole locations that would prevent a plate from being screwed down incorrectly
3) electrical plugs that can only be inserted into the correct outlets
4) notches on boards that only allow correct insertion into edge connectors
5) a flip-type cover over a button that will prevent the button from being accidentally pressed
    
Three levels of Poka-Yoke:
1) elimination of spills, leaks, losses at the source or prevention of a mistake from being committed
2) detection of a loss or mistake as it occurs, allowing correction before it becomes a problem
3) detection of a loss or mistake after it has occurred, just in time before it blows up into a major issue (least effective)

Kanban Production Control System


A kanban or “pull” production control system uses simple, visual signals to control the movement of materials between work centers as well as the production of new materials to replenish those sent downstream to the next work center.  Originally, the name kanban (translated as “signboard” or “visible record”) referred to a Japanese shop sign that communicated the type of product sold at the shop through the visual image on the sign (for example, using circles of various colors to indicate a shop that sells paint).  As implemented in the Toyota Production System, a kanban is a card that is attached to a storage and transport container.  It identifies the part number and container capacity, along with other information, and is used to provide an easily understood, visual signal that a specific activity is required.
In Toyota’s dual-card kanban system, there are two main types of kanban:
1. Production Kanban: signals the need to produce more parts
2. Withdrawal Kanban (also called a “move” or a “conveyance” kanban): signals the need to withdraw parts from one work center and deliver them to the next work center.
In some pull systems, other signaling approaches are used in place of kanban cards.  For example, an empty container alone (with appropriate identification on the container) could serve as a signal for replenishment.  Similarly, a labeled, pallet-sized square painted on the shop floor, if uncovered and visible, could indicate the need to go get another pallet of materials from its point of production and move it on top of the empty square at its point of use.
A kanban system is referred to as a pull‑system, because the kanban is used to pull parts to the next production stage only when they are needed.  In contrast, an MRP system (or any schedule‑based system) is a push system, in which a detailed production schedule for each part is used to push parts to the next production stage when scheduled.  Thus, in a pull system, material movement occurs only when the work station needing more material asks for it to be sent, while in a push system the station producing the material initiates its movement to the receiving station, assuming that it is needed because it was scheduled for production.  The weakness of a push system (MRP) is that customer demand must be forecast and production lead times must be estimated.  Bad guesses (forecasts or estimates) result in excess inventory and the longer the lead time, the more room for error.  The weakness of a pull system (kanban) is that following the JIT production philosophy is essential, especially concerning the elements of short setup times and small lot sizes, because each station in the process must be able to respond quickly to requests for more materials.
Dual-card Kanban Rules:
No parts are made unless there is a production kanban to authorize production.  If no production kanban are in the “in box” at a work center, the process remains idle, and workers perform other assigned activities.  This rule enforces the “pull” nature of the process control.
There is exactly one kanban per container.
Containers for each specific part are standardized, and they are always filled with the same (ideally, small) quantity.  (Think of an egg carton, always filled with exactly one dozen eggs.)

Decisions regarding the number of kanban (and containers) at each stage of the process are carefully considered, because this number sets an upper bound on the work-in-process inventory at that stage. For example, if 10 containers holding 12 units each are used to move materials between two work centers, the maximum inventory possible is 120 units, occurring only when all 10 containers are full.  At this point, all kanban will be attached to full containers, so no additional units will be produced (because there are no unattached production kanban to authorize production).  This feature of a dual-card kanban system enables systematic productivity improvement to take place.  By deliberately removing one or more kanban (and containers) from the system, a manager will also reduce the maximum level of work-in-process (buffer) inventory.  This reduction can be done until a shortage of materials occurs.  This shortage is an indication of problems (accidents, machine breakdowns, production delays, defective products) that were previously hidden by excessive inventory.  Once the problem is observed and a solution is identified, corrective action is taken so that the system can function at the lower level of buffer inventory.  This simple, systematic method of inventory reduction is a key benefit of a dual card kanban system.  

Just in time production (JIT)


Just in time is a ‘pull’ system of production, so actual orders provide a signal for when a product should be manufactured. Demand-pull enables a firm to produce only what is required, in the correct quantity and at the correct time.
This means that stock levels of raw materials, components, work in progress and finished goods can be kept to a minimum. This requires a carefully planned scheduling and flow of resources through the production process. Modern manufacturing firms use sophisticated production scheduling software to plan production for each period of time, which includes ordering the correct stock. Information is exchanged with suppliers and customers through EDI (Electronic Data Interchange) to help ensure that every detail is correct.
Supplies are delivered right to the production line only when they are needed. For example, a car manufacturing plant might receive exactly the right number and type of tyres for one day’s production, and the supplier would be expected to deliver them to the correct loading bay on the production line within a very narrow time slot.
Advantages of JIT 
1. Lower stock holding means a reduction in storage space which saves rent and insurance costs 
2. As stock is only obtained when it is needed, less working capital is tied up in stock 
3. There is less likelihood of stock perishing, becoming obsolete or out of date 
4. Avoids the build-up of unsold finished product that can occur with sudden changes in demand 
5. Less time is spent on checking and re-working the product of others as the emphasis is on getting the work right first time
Disadvantages of JIT 
1. There is little room for mistakes as minimal stock is kept for re-working faulty product 
2. Production is very reliant on suppliers and if stock is not delivered on time, the whole production schedule can be delayed 
3. There is no spare finished product available to meet unexpected orders, because all product is made to meet actual orders – however, JIT is a very responsive method of production 

Some Key Elements of JIT

1. Stabilize and level the MPS with uniform plant loading (heijunka in Japanese): create a uniform load on all work centers through constant daily production (establish freeze windows to prevent changes in the production plan for some period of time) and mixed model assembly (produce roughly the same mix of products each day, using a repeating sequence if several products are produced on the same line).  Meet demand fluctuations through end item inventory rather than through fluctuations in production level.  Use of a stable production schedule also permits the use of backflushing to manage inventory: an end item’s bill of materials is periodically exploded to calculate the usage quantities of the various components that were used to make the item, eliminating the need to collect detailed usage information on the shop floor. 
2. Reduce or eliminate setup times: aim for single digit setup times (less than 10 minutes) or “one touch” setup – this can be done through better planning, process redesign, and product redesign.  A good example of the potential for improved setup times can be found in auto racing, where a NASCAR pit crew can change all four tires and put gas in the tank in under 20 seconds.  (How long would it take you to change just one tire on your car?)  The pit crew’s efficiency is the result of a team effort using specialized equipment and a coordinated, well-rehearsed process.
3. Reduce lot sizes (manufacturing and purchase): reducing setup times allows economical production of smaller lots; close cooperation with suppliers is necessary to achieve reductions in order lot sizes for purchased items, since this will require more frequent deliveries.
4. Reduce lead times (production and delivery): production lead times can be reduced by moving work stations closer together, applying group technology and cellular manufacturing concepts, reducing queue length (reducing the number of jobs waiting to be processed at a given machine), and improving the coordination and cooperation between successive processes; delivery lead times can be reduced through close cooperation with suppliers, possibly by inducing suppliers to locate closer to the factory.
5. Preventive maintenance: use machine and worker idle time to maintain equipment and prevent breakdowns.
6. Flexible work force: workers should be trained to operate several machines, to perform maintenance tasks, and to perform quality inspections.  In general, JIT requires teams of competent, empowered employees who have more responsibility for their own work.  The Toyota Production System concept of “respect for people” contributes to a good relationship between workers and management.
7. Require supplier quality assurance and implement a zero defects quality program: errors leading to defective items must be eliminated, since there are no buffers of excess parts.  A quality at the source (jidoka) program must be implemented to give workers the personal responsibility for the quality of the work they do, and the authority to stop production when something goes wrong.  Techniques such as “JIT lights” (to indicate line slowdowns or stoppages) and “tally boards” (to record and analyze causes of production stoppages and slowdowns to facilitate correcting them later) may be used.
8. Small lot (single unit) conveyance: use a control system such as a kanban (card) system (or other signaling system) to convey parts between work stations in small quantities (ideally, one unit at a time).  In its largest sense, JIT is not the same thing as a kanban system, and a kanban system is not required to implement JIT (some companies have instituted a JIT program along with a MRP system), although JIT is required to implement a kanban system and the two concepts are frequently equated with one another.

Kaizen

           
Kaizen is a Japanese word meaning “Change for the good” or as we have come to know it today as meaning “Continuous Improvement.” The meaning was initially used as a Japanese philosophy of continuously improving everything we come in contact with during our lifetime.
When we refer Kaizen to our place of work it means to improve all facets, functions and processes within that business, from enquiry, concept, product or service processing, administration, office work, engineering, maintenance, IT, stores, logistics, planning, everything we do within that business and their suppliers should be subjected to Kaizen.  By continuously improving tilization systems, processes and support activities we improve Quality, Delivery Time, Service and Cost.
Kaizen is generally thought to be one of the essential and key parts of Lean and aims to eliminate Waste in the form of Non Value Adding work and when applied through employee teamwork, tilizati the work place.
Three Forms of Waste
1.      Mura
Unevenness in work demand or work flow. When embarking on JIT the first thing to do is to establish tiliza work flow (Heijunka) then create a system or combination of systems that triggers and signals pull work flow.
2. Muri
Having a greater demand than capacity in any given time or overburdening the process, series of processes or system. We can all generally relate to making mistakes when we are rushed or stressed this is caused by Muri. So we establish the capacity for work, (Noting that JIT needs for us to only plan to use 85% of capacity for some flexibility) and then ensure we do not try and force more into the system than it can handle.
8.                                                          Muda
There are type 1 and 2 Muda.
Type 1 is the necessary but non value adding waste. This is where from a business perspective we do it to meet regulations, cannot afford to duplicate, such as Pharmacies on every floor of a hospital, photocopiers, faxes and printers on every desk etc.
Type 2 is unnecessary, non value adding waste.
Muda is where the 7+1 lean waste resides.
1. Transport – Moving materials, people, files, documents, items of any type, products, information, by any means including electronically.
2. Inventory – Storage of any type of any item, information, document.
3. Motion – Bending, reaching, turning, lifting, and equipment left idling, any motion not creating value, like drilling air before contacting the work piece.
4. Waiting – in queues, for parts, for information, for instructions, for schedules, for equipment, for software, for previous process and for testing etc.
5. Over producing or production – basically making or producing more than the downstream customer immediately requires. Referred to as the biggest waste of lean.
6. Over Processing – Activity that does not add value or features for the end user, such as using materials of higher grade than required, producing to tighter tolerances than necessary, longer vintage time in wine making, over filling etc.
7. Defects or defective work – Includes any rework, scrap, incorrect information, inspection requirements, over compensating for excessive variation.
8. Skills and tilization – Not affectively using the collective talents, skills and knowledge of all employees and suppliers.


Internal and customer complient




FMEA FLOW



26 Dec 2013

Change management


Rework Flow chart Sample


NC Flow chart Sample




Customer satification report


8D REPORT

What is it: 8D Report is a structured step-by-step problem solving methodology for product and process improvement. The 8D Report involves identifying the root cause of a problem using data collection and data analysis, taking actions to resolve the problem, and preventing similar problems from occurring in the future. The 8D Report is structured into eight specific steps which require team synergy. Hence, the philosophy behind 8D is that the team as a whole is better and smarter than the quality sum of an individual.
Why use it: The primary difference between the 8D Report and other problem-solving approaches is the emphasis on involving the collective skills and knowledge of the TEAM versus doing it all yourself.
When to use it: The 8D Report is a problem solving tool for product and process problematic non-conformance's and improvement activities, ideally used for complex or urgent issues which an individual is unable to solve with a quick fix.
How to use it: The 8D Report consists of the 8 following steps below, please refer to the instruction presentation in the 8D Report template package for a more detailed explanation:


1D ESTABLISHING THE TEAM
First step is establish the team consists of few persons, that will be responsibility for realised particular step of 8D. Quantity of team and their making-up depends of complexion of the problem and taken decision.
The team should fulfil the following steps:
1. Have a good knowledge of the product and processes.
2. Multidisciplinary – that’s mean person with different department: Engineers (designers ), Technologists (production), Rework operator, , production staffs, Quality Engineers, Buyers, Others
3. Have adequate capability to introduce proper solution of the problem.
4. The team should have a Leader, who supervises and closes 8D.

2D Problem description
This is the stage where you need to most accurately describe the problem. Properly problem description is the starting point to further step of analysis and proper understanding of the nature of the problem for the Team as well as people from outside.
It’s recommend that description of the problem include:
1. Properly described the problem. Not restricted to laconic statements.
2. Place problem detected.
3. Scale of problem, eg. % of reject or qty of pcs / range deviations beyond the tolerance etc.
4. It’s very important that problem was „measurable” that is how many % or ppm or in another unit of measure.
5. Later this allows to properly assess whether corrective actions are implemented efficiently or not.
3D Containment action
This is the stage where are taken right containment action to prevent escalation of the problem (further making defects) or at the worst delivering not conforming products to the customer.
Example of action:
1. Stoppage of production / shipment
2. Additional visual control
3. Informing the Customer about the problem (for verification of the goods at the Custom.)
4. Segregation goods on OK / NOK
5. Informing operators about the problem
6. Check if similar products or processes, there is a similar risk (if yes – should be implemented the containment action)

4D Root Cause
To really eliminate the problem should be identify the real cause of the problem “root cause”. This is not a simple issue. This is why it is important the Team’s work to look at the problem with few sites. Often the real causes of many problems are deep in the management of the company.
The production process often throws up the cause of the problem on “operator error”. It is a mistake. The reasons are much deeper:
1. Lake of properly tools.
2. Lake of training or training aren’t efficient.
3. Overtime work in hurry (effect of wrong decisions of the management).
4. The production process is not suitable for quality requirements.
5. The others.

4D Root Cause
Define the cause of the problem using 5-WHY methodology (WHY 5 times)
Cause: A lot of short circuit on connector’s legs on PCB (after wave soldering
1-WHY: Why problem occurred? To less flux putting on pbca surface (that was the root cause of short circuits).
2-WHY: Why problem occurred? Wave soldering machine adjustment (flux amount) incorrect set up
3-WHY: Why problem occurred? Operator / Technologist didn’t know how process improvement.

4-WHY: Why problem occurred? Operator / Technologist training is incorrect (no efficiently). .
5-WHY: Why problem occurred?  No standard training material and no trainer to assure high level of Operators / Technologists knowledge.

If we identify the cause of the problem correctly then “eliminate” the root cause allows to really solve the problem and often many others

5D Corrective action
The Team determines which actions should be introduced in the short period of time to ensure that the process / product is controlled.
Examples:
1. Introducing additional control in process
2. Introducing additional other process (eg. Component reworked, test corrected)
3. Rework defective units found inside
4. Rework units returned from Customer
5. Inform the Supplier about defective part delivered and their Exchange, etc.

6D Validate corrective action
Please verify that the corrective actions taken are efficiently. It should be based on “ real data” from the process. Action should not be estimated on the basis of only the same opinion of the persons interested
Examples:
1. Less reject % (ppm) in process.
2. Test / control results shows improvement.
3. Engineering’s measurements (dimension, units appearance ) are correct (according to tolerance, specification).
4. Other proofs shows on Introducing corrective action.
5. Supplier delivers goods of better quality.

7D Prevent recurrence
Next step is is to determine what action should be taken to prevent recurrence of the problem. Here we define the action system to replace the actions defined in 5D.
Examples:
1. Modified or make proper jig (tooling).
2. Changing the process parameters in order to prevent defects.
3. Changing process / tools by Supplier which make parts.
4. Changing procedures (organisation change).
5. Changing documentation / specification (if was incorrect).
6. Preparing systematic and full training for staff.

8D Verify and congratulate Team
The last step is verified that the introduced actions in 7D are effective. It is
recommended that verification be made by comparing the scale of the problem (as described in 2D) with results from next deliveries of material or results from rejecting of next batches.

The verification must be based on that measurable data.   Leader of the Team is made verification During the verification it is worth to draw conclusions as the Team worked, what the individual members have learned and what are the conclusions for future – what can be improved on problem solving, etc.